No pointer captured when the pointer lock is applied

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
@@ skipping 3011 matching lines @@
   DocumentFragment* fragment = createFragmentForInnerOuterHTML(
       markup, contextElement, AllowScriptingContent, "insertAdjacentHTML",
       exceptionState);
   if (!fragment)
     return;
   insertAdjacent(where, fragment, exceptionState);
 }
 
 void Element::setPointerCapture(int pointerId, ExceptionState& exceptionState) {
   if (document().frame()) {
-    if (!document().frame()->eventHandler().isPointerEventActive(pointerId))
+    if (!document().frame()->eventHandler().isPointerEventActive(pointerId)) {
       exceptionState.throwDOMException(InvalidPointerId, "InvalidPointerId");
-    else if (!isConnected())
+    } else if (!isConnected()) {
       exceptionState.throwDOMException(InvalidStateError, "InvalidStateError");
-    else
+    } else if (document().page() &&
+               document().page()->pointerLockController().element()) {
+      exceptionState.throwDOMException(
+          InvalidStateError, "Cannot capture when the mouse is locked");

[Navid Zolghadr, 2017/04/10 17:16:14]

I believe we need to put the error in pointer event spec. Maybe using the same
invalidStateError?

[lanwei, 2017/05/17 13:56:00]

Done.

+    } else {
       document().frame()->eventHandler().setPointerCapture(pointerId, this);
+    }
   }
 }
 
 void Element::releasePointerCapture(int pointerId,
                                     ExceptionState& exceptionState) {
   if (document().frame()) {
     if (!document().frame()->eventHandler().isPointerEventActive(pointerId))
       exceptionState.throwDOMException(InvalidPointerId, "InvalidPointerId");
     else
       document().frame()->eventHandler().releasePointerCapture(pointerId, this);
@@ skipping 1222 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(Element) {
   if (hasRareData()) {
     visitor->traceWrappers(elementRareData());
   }
   ContainerNode::traceWrappers(visitor);
 }
 
 }  // namespace blink